Property Held For Sale Date Sold

No definition available.

Name:	cdr_PropertyHeldForSaleDateSold
Namespace Prefix:	cdr_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

This element represents the amount of gain (loss) on sale of properties during the reporting period net of the applicable income taxes realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 974
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-15.(a)(1)(ii))
-URI http://asc.fasb.org/extlink&oid=6875705&loc=d3e641549-123027

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 15
-Paragraph a
-Subparagraph 1(ii)
-Article 3

+ Details

Name:	us-gaap_GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_RealEstatePropertiesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Revenue from the sale of commercial, industrial, or residential property during the period. This element is more likely than not relevant to an entity for which real estate operations are a principal activity. If real estate operations are not a principal activity, the reporting entity would likely use a gain (loss) on sale of property, plant, or equipment type element.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(e))
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

+ Details

Name:	us-gaap_SalesOfRealEstate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	cdr_DisposalGroupClassificationAxis=cdr_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=cdr_BlueMountainCommonsLandParcelMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=cdr_HuntingdonPlazaLandParcelMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=cdr_UplandSquareLandParcelMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=cdr_OregonPikeLandParcelMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Real Estate (Schedule Of Land Parcels Sold) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Real Estate Properties [Line Items]
Sales Price	$ 4,075,000	$ 52,975,000
Gain on Sales		$ 6,413,000	$ 609,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Real Estate Properties [Line Items]
Sales Price			3,541,000
Gain on Sales			$ 481,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] \| Blue Mountain Commons Land Parcel [Member]
Real Estate Properties [Line Items]
Date Sold		Oct. 22, 2014
Sales Price		$ 350,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] \| Huntingdon Plaza Land Parcel [Member]
Real Estate Properties [Line Items]
Date Sold			Mar. 29, 2013
Sales Price			$ 390,000
Gain on Sales			$ 266,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] \| Upland Square Land Parcel [Member]
Real Estate Properties [Line Items]
Date Sold			Nov. 08, 2013
Sales Price			$ 1,700,000
Gain on Sales			$ 215,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] \| Oregon Pike Land Parcel [Member]
Real Estate Properties [Line Items]
Date Sold			Dec. 23, 2013
Sales Price			$ 1,451,000